code: def test_is_reducible():
      nqubits = 2
      (x, y, z, h) = create_gate_sequence()
  
      circuit = (x, y, y)
      assert is_reducible(circuit, nqubits, 1, 3) is True
  
      circuit = (x, y, x)
      assert is_reducible(circuit, nqubits, 1, 3) is False
  
      circuit = (x, y, y, x)
      assert is_reducible(circuit, nqubits, 0, 4) is True
  
      circuit = (x, y, y, x)
      assert is_reducible(circuit, nqubits, 1, 3) is True
  
      circuit = (x, y, z, y, y)
      assert is_reducible(circuit, nqubits, 1, 5) is True
  
file_path: sympy/sympy/physics/quantum/tests/test_identitysearch.py
imports: from sympy.external import import_module
  from sympy.core.mul import Mul
  from sympy.core.numbers import Integer
  from sympy.physics.quantum.dagger import Dagger
  from sympy.physics.quantum.gate import X, Y, Z, H, CNOT, IdentityGate, CGate, PhaseGate, TGate
  from sympy.physics.quantum.identitysearch import generate_gate_rules, generate_equivalent_ids, GateIdentity, bfs_identity_search, is_scalar_sparse_matrix, is_scalar_nonsparse_matrix, is_degenerate, is_reducible
  from sympy.testing.pytest import skip
label_desc: Use image node_id 9 for calling a global function with example usage: test_is_reducible() without return types